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A self defense weapon formed as a memo pad and which is easily held by a person's fingers, therefore making it possible to provide protection from a mugger and also to quickly and easily write a record or a message without failure of missing or forgetting significant information under a stressful situation.
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| Number | Title | Issue Date |
| 7796082 | Methods and apparatus for log-FTC radar receivers having enhanced sea clutter model Methods and apparatus to provide Log-Amp-detected radar sea clutter voltage modeled by a polynomial, such as a cubic polynomial, and using that model as a basis for sea clutter reduction filtering. In an exemplary embodiment, a navigational radar includes an STC fil... | 09/14/2010 |
| 7369079 | Universal input/output module A universal input/output module may be tailored to enable or disable a pull-up or pull-down function such that distinct type digital signals reaching the digital signal processor may be changed such that the distinct digital signals are similar in nature when proces... | 05/06/2008 |
| 7295152 | Timing adjustment method for radar, and radar apparatus having automatic timing adjusting function On/off timing of an amplifier and timing of antenna selection are accurately adjusted. When adjusting the on/off timing of the amplifier, modulation of a transmit signal is stopped, and a switch is set so as not to select any one of the antennas, thereby totally ref... | 11/13/2007 |
| 7145500 | Pulse wave radar device A pulse wave radar device controls an amplification degree of a receiving circuit, downward at a time of measuring an object at a short distance immediately after transmission of a transmitting pulse wave and upward, at a time of measuring the object at a long dista... | 12/05/2006 |
| 7075478 | Radar altimeter having an automatically calibrated sensitivity range control function A radar altimeter for an air vehicle is described. The radar altimeter includes a transmit antenna configured to transmit radar signals toward the ground, a receive antenna configured to receive radar signals reflected from the ground, the receive antenna also recei... | 07/11/2006 |
| 6972709 | Radio frequency transceiver A transceiver that includes a radio frequency source comprised of a monolithic millimeter wave integrated circuit. The transceiver generates a signal of a first frequency, which is then converted to a signal of a second frequency as the signal is conveyed through th... | 12/06/2005 |
| 6965341 | High resolution SAR processing using stepped-frequency chirp waveform A stepped-frequency chirped waveform improves SAR groundmapping for the following reasons. Range resolution in SAR image is inversely proportional to the transmitted signal bandwidth in nominal SAR systems. Since there is a limit in the transmitted bandwidth that ca... | 11/15/2005 |
| 6903679 | Video amplifier for a radar receiver A video amplifier for a radar receiver includes a temperature compensating attenuator. The attenuator includes a temperature sensitive device, such as a thermistor, arranged in a voltage divider network and is coupled in cascade between two filter stages. Each of th... | 06/07/2005 |
| 6842139 | Separation frequency detection in a radar level gauge A separation frequency detector circuit and a method for detection of a separation frequency in a radar level gauge. A first circuit element (1) is arranged to receive a first clock frequency, and a second clock frequency. An instantaneous value of the first ... | 01/11/2005 |
| 6741203 | Adaptive radar thresholds system and method A system and method for adapting weather radar gain is disclosed. The system and method includes estimating a freezing altitude. The system and method also includes determining, based on the freezing-altitude estimate, the altitude of more than one atmospheric layer... | 05/25/2004 |
| 6404378 | Device for increasing the dynamic range of frequency-modulated continuous-wave radar A device for increasing the dynamic range of frequency-modulated continuous-wave radar includes a transmitter, a send/receive antenna, a receiver circuit and a circulator. The circulator relays the transmission signals of the transmitter to the send/recei... | 06/11/2002 |
| 6104197 | Apparatus for acquiring waveform data from a metallic transmission cable An apparatus for acquiring waveform data from a metallic transmission cable under test includes a transmitter for generating interrogating pulses for examining a segment or segment lengths of the transmission cable under test. A variable gain receiver rec... | 08/15/2000 |
| 6087977 | False alarm rate and detection probability in a receiver An improved performance receiver associated with a radar system for detecting targets over a specified range area whereby the receiver, which is responsive to a return signal corresponding to an actual target or a false target, includes: an attenuator for... | 07/11/2000 |
| 5905459 | Methods and apparatus for stabilizing radar false alarm rate A radar system and method for operation of the same in a manner in which the false alarm rate is stabilized is provided. The system includes an automatic gain control (AGC) processing function which is utilized to control the pre-processed false alarm rat... | 05/18/1999 |
| 5805107 | Cost-effective method for determining a pulse response of a high-resolution, band-limited radar channel For less expensive estimation the impulse response xMOS of a high-resolution, band-limited radar channel in a radar station operating with an expanded transmitted pulse a(t), from a received signal e, over which a correlated or uncorrelated add... | 09/08/1998 |
| 5337054 | Coherent processing tunnel diode ultra wideband receiver A four-terminal network in tandem with a tunnel diode (TD) threshold receiver currently used in radar or communications improves its sensitivity. Previous inventors have shown that the temperature and sensitivity properties of a conventional TD threshold ... | 08/09/1994 |
| 5311184 | Airborne weather radar system with aircraft altitude and antenna tilt angle dependent sensitivity time control Sensitivity time control (STC) data for an airborne weather radar system is provided as a function of aircraft altitude and radar system antenna tilt angle to normalize radar return signals at high as well as low aircraft altitudes. In one form of the inv... | 05/10/1994 |
| 5298905 | Visible light detection and ranging apparatus and method A lidar apparatus for detecting an object. The lidar apparatus includes a laser providing a visible light output signal over a first field of view and a photodiode having a second field of view. At least some of the first and second fields of view overlap... | 03/29/1994 |
| 5293325 | Apparatus and method for compensating a radar's sensitivity timing control circuit The signal that controls the gain of a sensitivity timing control (STC) circuit is slimmed with a gain correction signal to compensate for gain variations introduced by items such as variations in the parameters of electronic components. A known test sign... | 03/08/1994 |
| 5221928 | Method and apparatus for accurate, high speed pulse-echo measurement calibration An apparatus comprises a signal input and a sampler and analog-to-digital (A/D) converter coupled to the signal input. The sampler and A/D converter forms a digital pre-look signal from an input signal. The apparatus further comprises a digital memory cou... | 06/22/1993 |
| 5196854 | Inflight weather and ground mapping radar The present invention is a radar system that corrects for changes in apparent reflectivity and two-way precipitation attenuation using a correction curve that includes a segment for low rain rates, a segment for high rain rates and, if desired, a transiti... | 03/23/1993 |
| 5115242 | In-furnace slag level measuring apparatus Disclosed is an in-furnace slag level measuring apparatus having a microwave radar for measuring a slag level in a convertor or the like. The level of a transmission signal or a reception signal is adjusted in accordance with the level of a detection sign... | 05/19/1992 |
| 5050986 | Synchronization system for controlling switches An optical ranging system includes optics that create a backscatter signal in response to a transmitted light pulse. The transmitted pulse is reflected from a target to provide range information. The backscatter signal is applied to trigger a threshold de... | 09/24/1991 |
| 4994811 | Sensitivity time control device In a sensitivity time control device for an imaging radar system with an automatic gain control attenuator, a sensitivity time control attenuator and an analog-digital converter, output signals of the analog-digital converter are applied, via a device (20... | 02/19/1991 |
| 4837579 | Pulse radar threshold generator A pulse marine radar system having a threshold generator providing a range dependent threshold waveform which is a function of sea conditions, rain conditions, and radar parameters. Based on the radar settings and inputs from the operator regarding the se... | 06/06/1989 |
| 4728953 | Closed loop control of receiver turn-on to increase radar sensitivity A radar system includes a variable delay circuit coupled between the transmitter and the receiver switch. A feedback loop including a comparator and an integrator is coupled between the receiver envelope detector and a control terminal for the variable de... | 03/01/1988 |
| 4529983 | Apparatus and method for the correction of attenuation-induced errors in a weather radar receiver Disclosed is a method and apparatus for adjusting the gain in a weather radar receiver to correct for precipitation induced transmission path attenuation. The receiver gain is controlled in a known manner to accommodate known path transmission effects. Th... | 07/16/1985 |
| 4524361 | Radar systems employing two kinds of pulses In a radar system frequency-modulated transmitter pulses of relatively long duration and frequency-modulated transmitter pulses of relatively short duration are generated and transmitted through a common transmitter channel, both channels containing a pul... | 06/18/1985 |
| 4509050 | Automatic adaptive sensitivity time control for a ground mapping radar An automatic adaptive sensitivity time control for a ground mapping radar comprises the dynamic range of radar returns for presentation on a video display. A feedback loop including a differential amplifier senses the magnitude of a signal presented to a ... | 04/02/1985 |
| 4451909 | Ultrasonic wave distance detection system In an ultrasonic wave distance detection system, an ultrasonic wave pulse radiated into the selected area is reflected on an object. Said reflected ultrasonic wave pulse is partly received by an ultrasonic wave transducer. The received signal is supplied ... | 05/29/1984 |
| 4435707 | Weather radar with signal compensation for precipitation A weather radar incorporating a sensitivity time control modifying circuit for adaptively increasing the gain of the IF amplifier as a function of precipitation rate; thereby increasing the range of the radar through the precipitation and identifying on t... | 03/06/1984 |
| 4415897 | Precision control of RF attenuators for STC applications Two STC configurations for precision control of RF attenuators, each configuration utilizing a log-scale electronic attenuator, are disclosed. The first configuration includes a D/A converter/linear-to-log module combination to provide a log range ramp; t... | 11/15/1983 |
| 4378596 | Multi-channel sonic receiver with combined time-gain control and heterodyne inputs In a receiver for pulsed ultrasonic beams, it is sometimes desirable to translate the received signal to a lower carrier frequency by a heterodyne process. It is also often desirable to vary the receiving channels' gain during the period when signals are ... | 03/29/1983 |
| 4370652 | Control systems for radar receivers An echo ranging weather radar system in which the bandwidth B of the radar receiver is made roughly equal to the bandwidth of the frequency spectrum of at least some expected weather echoes. In one embodiment, B TR is made equal to duri... | 01/25/1983 |
| 4307456 | Ultrasonic rangefinder An ultrasonic rangefinder providing a correct distance measurement and comprising a first transducer for transducing electric signals into ultrasonic waves and transmitting the ultrasonic waves, a second transducer for receiving the ultrasonic waves and t... | 12/22/1981 |
| 4228435 | Radar sensitivity time control using range gated feedback A sensitivity time control circuit for radar receivers, using range gated feedback where the video signal is sampled and compared to a desired signal at intervals based upon range sweep; as the radar antenna is reversing direction, integrated averages of ... | 10/14/1980 |
| 4213126 | Airport surface detection equipment (ASDE) The invention relates to an ASDE radar to supply information on airport surface traffic. A well-known ASDE radar comprises an antenna having an elevation-depending gain factor ##EQU1## for ω1 ࣘω | 07/15/1980 |
| 4194200 | Combined receiver protector, AGC attenuator and sensitivity time control device The passive receiver protector, AGC attenuator and sensitivity time control functions of a radar are combined in a single device which performs the functions in front of the radar low noise amplifier with relatively low loss. The receiver protector utiliz... | 03/18/1980 |
| 4189714 | Analog-to-digital circuit with adjustable sensitivity An analog-to-digital converter of the type using a plurality of voltage comparators, each, in response to an applied reference voltage and an analog voltage to be digitized, producing one of two logic signals depending on which of the applied voltages is ... | 02/19/1980 |
| 4169263 | Variable threshold signal detecting apparatus A variable threshold detecting circuit for use with radar signals where a given target will appear with the same intensity on the screen whether the target is nearby or far away. The 1/R4 decrease in amplitude of the returned radar signal is co... | 09/25/1979 |
